Interesting post, Hunter. But I'd also posit there is a strain of political thought in the United States that links Christianity to rugged individualism, decentralism, and skepticism of large-scale government. The Constitution Party, for example, is explicitly Christian (along Reformed, bordering on Reconstructionist lines) but on economic issues other than trade is similar to the Libertarian Party. Yet it is also restrictionist on immigration.
Christian Democrat politics doesn't represent some particularly American trends in conservative Christianity.